Answers

2016-01-31T22:44:02+05:30
Because they do not have enough carbon atoms to form a branched chain
0
isomerism is simply a way of arranging hydrogen atoms around the carbon ones . take ethane now there is no other way of arranging the hydrogen atoms around the carbon ones , so it does not have any isomer
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and for propane , if we attach an alkyl group we can do that only at the end of the chain , which is not possible , RULES are RULES
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